United States Nuclear Regulatory Commission - Protecting People and the Environment
Home > NRC Library > Document Collections > Reports Associated with Events > Event Notification Reports > 2007 > November 16

Event Notification Report for November 16, 2007

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
11/15/2007 - 11/16/2007

** EVENT NUMBERS **


43784

To top of page
Power Reactor Event Number: 43784
Facility: FERMI
Region: 3 State: MI
Unit: [2] [ ] [ ]
RX Type: [2] GE-4
NRC Notified By: GEORGE MILLER
HQ OPS Officer: JOE O'HARA
Notification Date: 11/15/2007
Notification Time: 06:34 [ET]
Event Date: 11/15/2007
Event Time: 03:13 [EST]
Last Update Date: 11/15/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
DAVE PASSEHL (R3)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
2 A/R Y 9 Startup 0 Hot Shutdown

Event Text

REACTOR SCRAM - INITIATION OF ARI CAUSED BY LEVEL 2 SIGNAL

"At 03:13 EST 11/15/2007, a reactor scram occurred due to initiation of ARI caused by a Level 2 signal from Div 1 level instrumentation. The reactor mode switch was taken to shutdown in response to the trip of the recirc pumps initiated by ARI as directed by our Abnormal Operating procedures. All control rods fully inserted into the core. The lowest reactor vessel water level reached was 183 inches. The MSIV's were manually closed to control cooldown rate. Reactor water level is being controlled by CRD and reactor water cleanup blowdown.

"At the time of the scram, protective tagging was being hung on the Division I Reference Leg Backfill system.

"At the time of the scram all ECCS systems and Emergency Diesel Generators were operable. This report is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), any event that results in actuation of the reactor protection system (RPS) when the reactor is critical."

The licensee is investigating the cause of the scram. There was no ECCS injection. Primary plant pressure is 400 psig, and primary plant temperature is 335 degrees Fahrenheit. The scram is uncomplicated.

The licensee notified the NRC Resident Inspector.

Page Last Reviewed/Updated Thursday, March 29, 2012
Thursday, March 29, 2012